Effective from 03/10/2026
Cookie policy
Which cookies and browser storage Výnosometr uses, why, for how long and how to change your consent.
In short: Without your consent we only use what the site needs to work and to protect it from abuse. Visit statistics (including Google Analytics cookies) run only with your consent. We use no advertising or cross-site tracking cookies.
1. What cookies and browser storage are
Cookies are small files a website stores in your browser; browser storage (localStorage and sessionStorage) works similarly. We use them only as listed below. The site is operated by Michal Smetana, company ID (IČO) 87769620, contact kontakt@vynosometr.cz. The Czech version of this policy is authoritative.
2. Strictly necessary (no consent needed)
These are needed for the service you use or for its security (Section 89(3) of Czech Act No. 127/2005 Coll.). They are not used for measurement or advertising and, apart from sign-in and saved calculations, never leave your browser.
| Name | Provider | Purpose | Duration | Category | Consent |
|---|---|---|---|---|---|
| vy-state-v1 (localStorage) | Výnosometr | Your calculation in progress | Until cleared | Necessary | No |
| vy-current (localStorage) | Výnosometr | Which saved calculation is open | Until cleared or sign-out | Necessary | No |
| vy-currency, vy-eur, vy-eur-manual (localStorage) | Výnosometr | Chosen currency and EUR rate | Until cleared | Necessary (settings) | No |
| vy-theme (localStorage) | Výnosometr | Light or dark mode | Until cleared | Necessary (settings) | No |
| vy-intro-v1 (localStorage) | Výnosometr | You have closed the intro tip | Until cleared | Necessary (settings) | No |
| vy-consent-v2, vy-consent-v2-meta (localStorage; older vy-consent-v1) | Výnosometr | Your consent choice and the date you made it | Until changed or cleared; we ask again after 12 months | Necessary | No |
| sb-…-auth-token, sb-…-auth-token-code-verifier (localStorage) | Supabase (for Výnosometr) | Signing in and completing sign-in securely | Until sign-out | Necessary (sign-in) | No |
| vy-pending-save (sessionStorage) | Výnosometr | Finishing a save after sign-in | Until the tab is closed | Necessary | No |
| __cf_bm, cf_clearance, _cfuvid (cookies) | Cloudflare | Protection against bots and attacks; set only when needed | __cf_bm 30 minutes, cf_clearance usually 30 minutes, _cfuvid browser session | Necessary (security) | No |
| Cloudflare Turnstile | Cloudflare | Bot check in the sign-in form; loads only when you sign in | During sign-in only | Necessary (security) | No |
| Tally feedback form | Tally BV (Belgium) | Showing and submitting the form; loads only after you click the Feedback link | See Tally's policy | Necessary (requested service) | No |
If you sign in with Google, Google sets its own cookies on its own pages as an independent controller under its rules.
3. Visit statistics (only with consent)
| Name | Provider | Purpose | Duration | Category | Consent |
|---|---|---|---|---|---|
| _ga (cookie) | Google Ireland Limited (Google Analytics 4) | Distinguishing visitors for aggregate statistics | 2 years or until you withdraw consent | Analytics | Yes |
| _ga_81EMLZDYDB (cookie) | Google Ireland Limited (Google Analytics 4) | Keeping the session state | 2 years or until you withdraw consent | Analytics | Yes |
| Cloudflare Web Analytics (no cookies) | Cloudflare, Inc. | Aggregate visit and page-speed statistics | Stores nothing in your browser | Analytics | Yes |
| Calculator statistics (no cookies) | Výnosometr | Which parts of the calculator are used, without amounts; random ID only while the page is open | Stores nothing in your browser | Analytics | Yes |
Measurement scripts load only after you consent. With Do Not Track or Global Privacy Control on, Google Analytics and calculator statistics do not run even with consent. Google Analytics advertising features and Google signals are off. Error reports and browser content-blocking (CSP) reports store nothing in your browser and run without consent on the basis of legitimate interest. Details on processing, transfers to the USA and your rights are in the privacy policy.
4. How to give, change or withdraw consent
You choose in the banner on your first visit; we ask again after 12 months. You can change your choice at any time with the button below or via Cookie settings in the footer. When you withdraw consent we delete the Google Analytics cookies and measurement stops. Declining does not limit the site in any way.
You can also delete all data stored by the site in your browser settings (clear site data for vynosometr.cz). This also removes your calculation in progress and signs you out.
5. Embedded widget
The calculator widget embedded on other websites (vynosometr.cz/embed/) uses no cookies, browser storage or measurement.
6. Changes
We update this overview whenever the cookies we use change. The effective date is shown at the top.